A typical AC motor consists of two parts: 1) an outside stationary stator having coils supplied with AC current to produce a rotating magnetic field and; 2) an inside rotor attached to the output shaft that is given a torque by the rotating field. There are two fundamental types of AC motor depending on the type of rotor used: 1) the synchronous motor, which rotates exactly at the supply frequency or a submultiple of the supply frequency and; 2) the induction motor, which turns slightly slower, and typically (though not necessarily always) takes the form of the squirrel cage motor.

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Baldor's extensive line of General Purpose motors are available in Open Drip-proof and TEFC construction in both single and three phase. Horsepower sizes available from stock range from 1/12 HP through 1500 HP. Designed for "general purpose" use means that these motors can be used in applications which include compressors, pumps, fans, conveyors, material handling, machine tools and many others. Also available are stock motors that are direct replacements for the motors built in Pre-1952 NEMA frames.